Blindstitch-machine.



L. ONDERDONK.

BLINDSTITOH MACHINE.

APPLICATION FILED DEC. 31, 1901. 1 070,353, Patented Aug. 12, 1913.

2 SHEETS-SHEET 1.

L. ONDERDONK.

BLINDSTITCH MACHINE.

APPLICATION FILED DEG.31,1901.

1,070,353. Patented Aug. 12,1913.

2 SIGHTS-SHEET 2.

i Slzvanfzr $0? I 7% UNITED STATES PATENT carton.

LANSING ONDERDONK, OF NEW YORK, N. Y., .ASSIGNOB TO UNION SPECIAL SEWING MACHINE 00., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BLINDSTITOH-MACHINE.

Application filed December 31, 1901. Serial No. 87,960.

To all whom it may concern: I

Be it known that I, LANSING ONDERDONK, a citizen .of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Blindstitch-Machines, of which the following is a descripating with a needle which reciprocates back and forth across the line of feed, passing its thread through the. material which is crimped over the throat plate. of "machine is shown generally in my prior patent No. 720,732, granted February 17th, 1903; but the objectof the present invention is to provide a looper thread retainer or controller, cooperating with a looper which may travel in a horizontal plane above the needle, to take the looper thread and carryit below the path of the needle, so that the needle in its next movement to pass into the goods, will engage the looper thread in its operation of forming an overcast stitch.

By this improvement, an up and down, or inclined movement of the looper to cause it to take the needle loop above the needle, and then carry its own loop to a point-below the needle on the other side the line of the seam, may be dispensed with, and the looper be made to move in a horizontal plane, the looper thread spreader; retainer or plunger, acting as above set forth.

The invention consists in the various features hereinafter described and referred to in the appended claims.

The invention is illustrated in the ammo Such a type 2-, 1 represents the standard, 2, the gooseneck, and 3 the depressible work support. of the' machine, the latter having a cloth plate 4, formed with a V-shaped ridge, over which the material to. be sewed is crimped. The feeding mechanism is of the usual type as shown in- Fig. 2 and consists of a. feed dog which is moved back and forth to feed the material, and up and down so as to be brought into and outof contact with the material. The crimping: member is carried by the Work support, which is normally stationary-and therefore, said crimping memher is normally stationary relative to the feeding movement of the feed dog. The looper 5 is secured upon a vertical bar 6, mounted in hearings in the head of the machine, the looper oscillating upon its vertical axis in a horizontal plane, the bar 6 being oscillated by crank and pitman connect-ions 7, 8, fro m'the belt Wheel 9 of the machine.

The needle 10 is curved as shown, and mounted upon the lower end of a swinging arm 11, the upper end of which is driven by pitman and eccentric connections from the driving shaft A. This needle reciprocates back and forth through the goods, across the line of feed in the manner illustrated in connection with the above mentioned patent.

B represents a curved lever pivoted on a stud 12, secured in a lug 13 on the machine Patented Aug. 12, 1913. I

frame. It is operated from an eccentric on the main shaft through a pitman connection 14. At the lower end of this lever is secured a rod or plunger 15, which is of shape at its lower end to engage the looper thread.

Byreason of the curved shape of the lever B, this part 15 travels in the arc of a circle from a pointabove the needle to a point below it, in a single plane, and is so timed that when the looper commencesto recede from its extreme point of movement beyond the path of the needle, the retainer 15 moving toward'the low pointwill engage the looper' thread, and as its movement continues'will carry the looper thread below the path of the needle, so that the needle will pass above it, and thus secure the looper thread in position necessary in forming the overcast stitch.

The relation of the parts in forming the stitch is shown in Figs. 3, and 4:;in the former the looper is shown at the extreme point beyond the path of the needle, and

illustrates also that the looper thread, from the eye of the looper, to the point where it is tied up in a stitch in the seam, is beyond the path traveled by the spreader or retainer 15. It will be noticed also from this figure that, it is when the lower end of spreader 15 is above the path of the looper thread that the looper carries its thread beyond the path of said spreader. As shown in Fig. 4, however, when the looper begins to recede from its extreme point the spreader moves for ward and swings downwardly to engage the looper thread and carry it into position to be engaged by the needle. It will be seen, therefore, that the operation of the spreader is such as not to interfere with the looper thread other than at the desired time, and that when the spreader has moved back a certain distance from the position shown in Figs. 1 and 4, it will shed the looper thread, so that it can be drawn up into the stitch properly by the action of the looper, and looper thread take up 16.

In Figs. 5 and 6, another mechanism for operating the looper thread retainer or spreader is shown, Fig. 5 being a front view and Fig. 6 a side view, illustrating the same. The bar B carrying the spreader 15, is driven by a crank B secured to the head of the machine by a stud through a hole in the head of the machine.

its bearing B The latter is secured to the head of the machine through the lug B in which'it has a bearing free to turn, so as to conform to the action of the spreader bar B, the part B of the bearing B having a turning fit in the lug B, so when the spreader bar receives its swinging movement by the action of the crank B which is connected to an eccentric on the driving shaft through ball and stud and pitman connections, as the crank 13 swings on its stud, the bar 13 being free to slide up and down in its bearing B and the latter being free to turn in its bearing, each end of the bar B describes the arc of a circle, as shown in the dotted line in Fig. 5, which line of movement is on a shorter radius than described by the spreader in Fig. 1, and, therefore, will release the looper thread somewhat more freely than in the other construction.

Various minor modifications and changes may be made without departing from the spirit of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is':

l. A'blind stitch sewing machine, comprising an overhanging arm, a depressible work support beneath the same, a crimping member carried by said work support, a feeding device operating upon each side of said crimping member, said crimping mem- B is a free turning bearing for the spreader bar B the latter being free also to slide up and down in her being immovable in the line of feed, a curved needle supported by the overhanging arm above the work support, means for operating the same to reciprocate the needle back and forth across the line of feed, a thread-carrying implement cooperating with said needle and supported by the overhanging arm, said thread-carrying implement moving in substantially a horizontal plane, and a thread-manipulating device arranged to engage the loop of thread carried by the thread-carrying implement and carry the same into position for the needle to enter said loop.

2. A blind stitch sewing machinecomprising a supporting standard, an overhanging arm carried thereby, a cylindrical work support carried by said standard and projecting therefrom, a crimping member carried by said work support, a feeding device mounted within said Work support and operating upon each side of the crimping member, said crimping member being normally stationary relative to the feeding movement of the feeding device, a curved needle supported by the overhanging arm above the work support, means for operating the same, a thread-carrying implement cooperating with said needle and supported by the overhanging arm, said thread-carrying implement moving in substantially a horizontal plane, and a thread manipulating device arranged to enter the loop of thread carried by the thread.-canying implement, and carry the same into position for the needle to enter said loop.

3. In a blind stitch sewing machine, in combination with a normally stationary work support, a feeding mechanism carried thereby, said work support having means thereon for crimping the work, an

overhanging arm, a curved needle reciprocating back and forth across the line of feed above the cloth plate, a thread-carrying looper oscillating in a single plane above the needle, from a point atone side the line of feed where it engages the needle thread, to a point at the opposite side of said line of feed, and a looper thread-engaging device with means for moving it in a single plane from a pointabove the needle to a point below it on the opposite side the line of scam from that in which the looper engages the needle thread to cause it to engage the looper thread and carry it into position, so

work support and in a plane below said needle, said needle being supported by the overhanging arm above the work support,

loop taking device also mounted above said work support and a thread manipulating device mounted and operating wholly above said'work support and having a movement to position a loop of thread for entrance by the needle.

5.. In a blind stitch sewing machine, a needle, an overhanging arm, a normally stationary depressible work support, a crimping member carried by said work support and arranged in a plane above said work support and in a plane below said needle, said needle being supported by the overhangin arm above the work support, means for operating the needle across the apex of the crimping-device, a cooperating loop taking device also mounted above said work supportand a thread manipulating device mounted and operating wholly above said work support and having a movement to position a loop of thread for entrance by the needle, said manipulating device holding said loop while the needle is in its. retracted position. 1

6. In a sewing machine, a needle with means for reciprocating it back and forth across the line of feed, a looper with means for reciprocating it back and forth across the line of feed,'a rocking bearing on the machine frame, a rod or bar freely supported in said bearing, a crank upon the upper end (if-said rod or bar, and connections between the same and the driving shaft, and a spreader or retainer for the lodper thread carried by said bar or rod; substantially as described.

7. In a sewing machine, a needle with means for reciprocating it back and forth across the line of feed, a looper with means" Q for reciprocating it back and forth across the line of feed, a bearing pivoted on the machine frame, a rod or bar having vertical movement therein, a crank pivoted 0n the machine frame, to which the upper end of said rod or bar is pivotall means for oscillating sai crank, and a spreader or retainer for the looper thread.

carried by described. I

In testimony whereof'I atfix my signature, in presence of two witnesses.

" LANSING ONDERDONK.

Witnesses:

W. H. Mom,

W. L. SWIFT.

said rod or bar; substantially as attached, and 

